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Документы 41 - 49 из 49
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41.
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Авторы:
Sokolov Vasiliy Dmitrievich, Samsonov Sergey Nikolaevich
Заглавие: The dynamics of auroral absorption parameters in the 22nd solar activity cycle

Количество страниц: 3 с.

Examination of auroral absorption (AA) occurrence rate and AA meridional distribution versus local time and in the course of the solar cycle has been performed by riometer observations from 1985 to 1995 at the longitude of Yakutsk. Geomagnetic latitude of the region of absorption maximum occurrence changes in the course of the solar cycle from 66.5° to 64.4°. The largest displacement of this region to lower latitudes is observed during years of maximum solar activity. The half-width of the region is ~8° at solar minimum and ~10° at solar maximum. It has been also revealed that the region of AA is shifted to higher latitudes at daytime (1000-1400LT), and to lower ones in the evening (1800-2000LT), the displacement from the daily average position being ~1° and ~3° in the years of solar activity maximum and minimum, respectively. In all years at 2000-2100LT a short-term extension of the AA region by 1-4° is observed. The interpretation of the observationa is proposed.

Sokolov, V. D. The dynamics of auroral absorption parameters in the 22nd solar activity cycle / V. D. Sokolov, S. N. Samsonov // Physics of auroral phenomena : proceedings of the 26th annual seminar, 25 - 28 February 2003. – 2003. – P. 95-97.

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42.
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Авторы:
Skryabin Nikolay Georgievich, Samsonov Sergey Nikolaevich, Plotnikov Igor Yakovlevich
Заглавие: Influence of a change in solar magnetic field polarity on the Jovian electron flux intensity

Количество страниц: 3 с.

The Jupiter is a powerful regular source of high-energy electrons (0,2-40 MeV). In this connection their density in the near-Earth space systematically increases with a period of 399 days, which is coincident with the synodic period of Jupiter. According to our estimations, their energy is sufficient to produce a significant local reduction of the magnetic field in the IMF sector connected with the Jupiter. In this paper the evidence is presented that the electron fluxes in the Jovian sector are controlled by the general magnetic field of the Sun. A treatment of 399-day intervals of the electron fluxes and IMF, obtained from spacecraft data for the period of 1963 to 2000 has been performed by superposed epoch technique taking into account the periodic change of the solar magnetic field polarity. Having adopted the Jupiter opposition day to be an epoch zero, the changes in particle intensity and IMF components under different signs of the general magnetic field of the Sun are found by using a large dataset (9925 days). The times of 399-day variation maxima in different periods of solar activity are compared and a character of their displacement relative to Jupiter opposition momentsis discussed.

Skryabin, N. G. Influence of a change in solar magnetic field polarity on the Jovian electron flux intensity / N. G. Skryabin, S. N. Samsonov, I. Ya. Plotnikov // Physics of auroral phenomena : proceedings of the 26th annual seminar, 25 - 28 February 2003. – 2003. – P. 159-161.

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43.
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Авторы:
Boroyev Roman Nikolaevich, Gelberg Mikhail Germanovich
Заглавие: Dependence of longitudinal localization of substorm center on geosynchronous orbits on the IMF Bγ-component

Количество страниц: 4 с.

The dependence of the longitudinal substorm center localisation on geosynchronous orbits on the IMF Bγ-component has been studied. It is shown that the local magnetic time of the longitudinal substorm center localisation in the magnetosphere varies from evening hours to morning hours as the Bγ-component increases. At low solar wind speeds the substorm centers localize nearer to the evening sector. The ionospheric projection of the substorm center magnetospheric localisation shifts westward at By0. Maximum longitudinal shifts of substorm centers in the ionosphere relative to their location in the magnetosphere are - 3.5 h at Bγ=-4 nT and 3.5 h at Bγ=4.4 nT. Thus, the change of the substorm center localisation relative to the midnight in the ionosphere is caused by both the change of the substorm center position in the magnetosphere and a turn of the magnetotail relative to X-axis.

Boroyev, R. N. Dependence of longitudinal localization of substorm center on geosynchronous orbits on the IMF Bγ-component / R. N. Boroyev, M. G. Gelberg // Proceedings of the Fifth International Conference on Substorms : 16-20 May 2000 Congress Centre of the Arctic and Antarctic Research Institute, St. Petersburg, Russia. − Noordwijk, Netherlands : European Space Agency, 2000. − P. 41-44.

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44.
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Автор:
Boroyev Roman Nikolaevich
Заглавие: Dynamics of the field-aligned current during substorms with a sharp onset of the expansion phase

Количество страниц: 4 с.

By using satellite magnetic field measurements it is shown that before the substorm expansion phase onset the field-aligned currents of zone 2 type are not always observed on the geosynchronous orbits at the midnight sector. The relationship between the appearance of the field-aligned currents of zone 2 types before the beginning of the substorm expansion phase and the active phase duration and the preceding magnetic disturbance level has been found. It is found that if the expansion phase lasts less than 11 min, the appearance probability of the field-aligned current of zone 2 type before the substorm expansion phase onset T0 decreases. As the geomagnetic activity rises before a substorm, the probability of the beginning of the field-aligned currents before T0 increases. These results indicate that substorms in which the field-aligned currents of zone 2 type the T0 onset are absent, can be probably developed in the distant part of the magnetotail.

Boroyev, R. N. Dynamics of the field-aligned current during substorms with a sharp onset of the expansion phase / R. N. Boroyev // Proceedings of the Fifth International Conference on Substorms : 16-20 May 2000 Congress Centre of the Arctic and Antarctic Research Institute, St. Petersburg, Russia. − Noordwijk, Netherlands : European Space Agency, 2000. − P. 377-380.

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45.
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Авторы:
Velichko Vitaly Andreevich, Boroyev Roman Nikolaevich, Gelberg Mikhail Germanovich, Baishev Dmitriy Gavrilievich, Olson John, Morris Robert John, Yumoto Kiyohumi
Заглавие: Asymmetry in substorm development in the earth's northern and southern hemispheres

Количество страниц: 4 с.

Asymmetry in substorm development in the earth's northern and southern hemispheres / V. A. Velichko, R. N. Boroyev, M. G. Gelberg, D. G. Baishev, J. V. Olson, R. J. Morris, K. Yumoto // Physics of auroral phenomena : proceedings of the 25th annual seminar, Apatity, 26 February – 1 March 2002. – 2002. – P. 33-36.

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46.
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Авторы:
Sokolov Vasiliy Dmitrievich, Samsonov Sergey Nikolaevich
Заглавие: Dependence of appearance frequency of auroral absorption on its intensity

Количество страниц: 4 с.

Sokolov, V. D. Dependence of appearance frequency of auroral absorption on its intensity / V. D. Sokolov, S. N. Samsonov // Physics of auroral phenomena : proceedings of the 25th annual seminar, Apatity, 26 February – 1 March 2002. – 2002. – P. 55-58.

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47.
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Авторы:
Hori Tomoaki, Shinbori Atsuki , Nishitani Nozomu, Kikuchi Takashi, Fujita S. , Nagatsuma Tsutomu , Troshichev Oleg Alexandrovich, Yumoto Kiyohumi, Moiseyev Aleksey Vladimirovich, Seki K.
Заглавие: Evolution of negative SI-induced ionospheric flows observed by SuperDARN King Salmon HF radar

Количество страниц: 14 с.

The spatial evolution of vortex-like flow structures induced by a negative sudden impulse (SI-) is studied on the basis of SuperDARN King Salmon HF radar (KSR) with other ground and satellite data. A large dip in the solar wind density induced a fairly large SI- with a SYM-H amplitude of ~40 nT. The SI-induced ionospheric flow signatures in the evening sector (MLT ~ 19 h) were observed by KSR as a westward flow associated with the preliminary impulse (PI) followed by a more intense eastward flow with the main impulse (MI) in the sub-auroral region on the magnetic latitude ~60-70 deg, consistent with the local ground magnetic field observations. Following the first PI-MI flow sequence, KSR saw a second and possibly third sequence of flow variation which were much smaller in flow amplitude than the first pair but showed qualitatively very similar flow variations and latitudinal/longitudinal propagation characterististics/ These observations can be interpreted as aftershocks of the first PI-MI; the same sequence of vortices and field-aligned currents were generated and then drifted anti-sunward with the same mechanism, namely the pumping motion of dayside magnetosphere. These results are qualitatively consistent with predictions suggested by recent numerical simulations.

Evolution of negative SI-induced ionospheric flows observed by SuperDARN King Salmon HF radar / T. Hori, A. Shinbori, N. Nishitani, T. Kikuchi, S. Fujita, T. Nagatsuma, O. Troshichev, K. Yumoto, A. Moiseyev, and K. Seki // Journal of Geophysical Research: Space Physics. – 1978. – 2012 (December), vol. 117, N 12. – P. A12223.
DOI: 10.1029/2012JA018093

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48.
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Авторы:
Solovyev Stepan Ivanovich, Moiseyev Aleksey Vladimirovich, Yumoto Kiyohumi, Engebretson Mark
Заглавие: Magnetosphere-ionosphere response to magnetosphere compression by the solar wind

Количество страниц: 4 с.

Analysis of the global magnetosphere-ionosphere response to solar wind dynamic pressure variations under the negative IMF Bz has been performed. It is shown that an increase in the dynamic pressure leads to a double response of the ionospheric currents and aurora, i.e. simultaneously (within the accuracy of 1 min) and ~5-7 min afterward. Thereby, the eastward and westward convective electrojets are enhanced in the evening and morning sectors respectively, followed by the intensification of the westward current in the near midnight and evening sectors. The intensification of the electrojets is followed by extension of the diffuse precipitation zone and its high latitude boundary movement to the pole and to the east in the midnight-to-morning sector. In our case, no poleward or westward extension of aurora before midnight is observed. The disturbance triggered by a dynamic pressure increase may be considered as a convection disturbance associated with reconstruction of the DP2 current system.

Magnetosphere-ionosphere response to magnetosphere compression by the solar wind / S. I. Solovyev, A. V. Moiseyev, K. Yumoto, M. Engebretson // Physics of auroral phenomena : proceedings of the 26th annual seminar, 25 - 28 February 2003. – 2003. – P. 41-44.

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49.
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Авторы:
Foerster M., Mishin Vilen M., Saifudinova Tamara Ivanovna, Bazarzhapov Alexander Dashitsyrenovich, Sapronova Lyudmila Alexandrovna, Golovkov Vadim Petrovich, Stauning P., Watermann J., Solovyev Stepan Ivanovich
Заглавие: Dynamics of the Ionospheric Convection Systems Observed during The Super-Storm on Nov. 20, 2003

Количество страниц: 3 с.

In the accompanying Papers 1 and 2 was fulfilled timing of the 20.11.05 super-storm. Were detected 4 various types of the magnetospheric disturbances observable at southward IMF, and presented a new model of the field-aligned currents density spatial distribution in the polar ionosphere. In this paper are described the ionospheric convection systems, characteristic for the above various types. Are mentioned the mesoscale spatial inhomogeneities, which are observed more or less regularly but have not been mentioned in the past literature.

Dynamics of the Ionospheric Convection Systems Observed during The Super-Storm on Nov. 20, 2003 / M. Foerster, V. M. Mishin, T. I. Saifudinova, A. D. Bazarzhapov, L. A. Sapronova, V. P. Golovkov, P. Stauning, J. Watermann, and S. I. Solovyev // Solar Extreme Events Fundamental Science and Applied Aspects Nor-Amberd, Armenia 26-30 September 2005 : proceedings of the Second International Symposium / edited by A. Chilingarian and G. Karapetyan. − Erevan : Cosmic Ray Division, Alikhanyan Physics Institute, 2006. − P. 83-85.

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